EP 0763184 A1 19970319 - POSITION TRANSDUCER
Title (en)
POSITION TRANSDUCER
Title (de)
POSITIONSDETEKTOR
Title (fr)
DETECTEUR DE POSITION
Publication
Application
Priority
- SE 9500633 W 19950601
- SE 9401889 A 19940601
- SE 9403428 A 19941010
- SE 9500598 A 19950217
- SE 9501235 A 19950401
- SE 9501711 A 19950505
- SE 9501712 A 19950505
- SE 9501713 A 19950505
Abstract (en)
[origin: WO9533180A1] An encoder disc (101) of an optical position transducer is mounted on a short protruding part (102a) of a rotor (102) of an electric motor close to torque creating parts. One part of the optical system, normally the light emitter part (108, 115), is insertable between the rotor (102) and the encoder disc (108) after the insertion of the rotor-encoder disc assembly into the motor stator case (113). The optical incremental encoder signals are fed both to a moderate frequency digital counter that counts (4) counts per basic encoder period and to an AD converter that samples and digitises the primary encoder analog signals. A synchronising network ensures that the primary encoder digitised signal corresponds to the correct state of the digital counter. More than one decoder head can be used to compensate for the bearing play common in servo motors having varying axial loads. This construction gives a high speed resolution and fast speed response, is very compact and operates with modest demands on bearing precision.
IPC 1-7
IPC 8 full level
G01D 5/347 (2006.01)
CPC (source: EP US)
G01D 5/3473 (2013.01 - EP US)
Citation (search report)
See references of WO 9533180A1
Designated contracting state (EPC)
AT CH DE ES FR GB IE IT LI SE
DOCDB simple family (publication)
WO 9533180 A1 19951207; AU 2686995 A 19951221; EP 0763184 A1 19970319; US 5998783 A 19991207; US 6084234 A 20000704; US 6172359 B1 20010109; US 6191415 B1 20010220
DOCDB simple family (application)
SE 9500633 W 19950601; AU 2686995 A 19950601; EP 95922044 A 19950601; US 26468799 A 19990309; US 32657499 A 19990607; US 33098599 A 19990614; US 76517897 A 19970114